Sofa



FIG. 1 is a top plan view of the sofa;

FIG. 2 is a side elevation view thereof;

FIG. 3 is a front perspective view thereof;

FIG. 4 is a front elevation view thereof;

FIG. 5 is an opposite side elevation view thereof; and,

FIG. 6 is a rear elevation view thereof. 

I claim the ornamental design for a sofa, as shown and described. 